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<head>
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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    <title>Document</title>
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<script src="./js/index.js"></script>
<body>
    <div id="box">
        <div id="div">
            <input type="checkbox" name=""><span>全选</span>
            <a href="javascript:;">反选</a><br>
        </div>
        <div id="div1">
            <input type="checkbox" name="" id="">选项(一)
            <input type="checkbox" name="" id="">选项(二)
            <input type="checkbox" name="" id="">选项(三)
            <input type="checkbox" name="" id="">选项(四)
            <input type="checkbox" name="" id="">选项(五)
            <input type="checkbox" name="" id="">选项(六)
            <input type="checkbox" name="" id="">选项(七)
            <input type="checkbox" name="" id="">选项(八)
        </div>
    </div>
</body>

</html>